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11B nuclear magnetic resonance study of boron nitride nanotubes prepared by mechano-thermal method

journal contribution
posted on 01.05.2005, 00:00 authored by C Lee, S H Park, J Jung, K S Ryu, S Nahm, J Kim, Ying (Ian) ChenYing (Ian) Chen
We reported 11B nuclear magnetic resonance studies of boron nitride (BN) nanotubes prepared by mechano-thermal route. The NMR lineshape obtained at 192.493 MHz (14.7 T) was fitted with two Gaussian functions, and the 11B nuclear magnetization relaxations were satisfied with the stretched–exponential function, exp[-(tlT1)(D+1)/6] (D: space dimension) at all temperatures. In addition, the temperature dependence of spin–lattice relaxation rates was well described by Ti-1 = aT (a: constant, T: temperature) and could be understood in terms of direct phonon process. All the 11BNMR results were explained by considering the inhomogeneous distribution of the paramagnetic metal catalysts, such as α-Fe, Fe–N, and Fe2 B, that were incorporated during the process of high-energy ball milling of boron powder and be synthesized during subsequent thermal annealing. X-ray powder diffraction as well as electron paramagnetic resonance (EPR) on BN nanotubes were also conducted and the results obtained supported these conclusions.

History

Journal

Solid state communications

Volume

134

Issue

6

Pagination

419 - 423

Publisher

Elsevier Ltd

Location

Amsterdam, The Netherlands

ISSN

0038-1098

eISSN

1879-2766

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2005, Elsevier Ltd